Methods for gas filtration in fluid processing systems

A gas filter system comprising:

• a filter assembly comprising:
• a casing comprising:
• a first sleeve comprised of a polymeric film and bounding a compartment, the first sleeve having an inlet opening communicating with the compartment and a first outlet opening communicating with the compartment;
• and
• a first exhaust port bounding a port opening, the first exhaust port being coupled with the first sleeve;
• a first filter comprising a porous filter body through which gas can pass, the first filter being coupled with the first exhaust port so that the filter body is at least partially disposed within the compartment of the first sleeve;
• and
• a first heating jacket encircling the first sleeve so as to sit directly against the first sleeve.